Why should age matter in posts

The higher the post, the older a government official is. This age sequence is based on three basic hypotheses, which are not necessarily true, says an article in Oriental Morning Post. Excerpts:

An author, researching on the average age of government officials at all levels, was surprised to find that some town officials were in their 30s, and others even younger. Officials' average age varies according to their posts. For example, provincial officials are generally in their 50s, county officials, 40s, and town officials, 30s.

This age sequence is based on three basic hypotheses. First, lower-level posts require less experience. Second, older officials have poorer health. Third, all grassroots officials get promoted over time.